Twice now the Luka led Mavs have made deep runs with teams that have another good guard and not much else. That 2022 team made the WCF, and lost to a superior Warriors team. They upset a 64 win Phoenix team in the 2nd round. This year, this Dallas team has been the underdog in every series, though once Kawhi got hurt in the first, it was clear they'd beat the Clippers. Their role players really over-performed all three rounds until Boston basically returned them back to their norm.
However, I agree with what knox and you say in that his weaknesses (and whining) are full on display and doing nothing to help the team ultimately win. Luka was foul baiting on offense and just hacking everyone on defense in the 2nd half, which was doing nothing to contribute to his team winning. He whined about every non-call or call on him. And yes, he's hardly the first player to do such a thing (LeBron whines all the time), but if you're not also adding production to the team in those moments, you're hurting them.
